My iMac stopped working, the screen remained on.

My iMac stopped playing iTunes and I found that the wireless mouse cursor could be moved around but it was otherwise inoperable.
My only remedy was to switch off on the start button and re-boot.
The machine booted ok and is now working ok but I am concerned that the event may be symptomatic of trouble to come!!
Has anyone got any clues to this type of problem?

You would need to look at your crash log and figure out what caused this lockup. Unless it becomes a frequent event I would just forget about it.

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